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By Civil Engineering Mcqs Waste Water Engineering No Comments

If the depletion of oxygen is found to be 5 ppm after incubating a 2.5% solution of sewage sample for 5 days at 21°C, B.O.D. of the sewage is_____________________?

A. 50 ppm
B. 100 ppm
C. 150 ppm
D. 200 ppm

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